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<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtquick-index.html">Qt Quick 模块</a></td><td ><a href="qtquick-qmlmodule.html">QML类型</a></td><td >AnchorChanges QML 类型</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">目录</a></h3>
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<li class="level1"><a href="#properties">属性</a></li>
<li class="level1"><a href="#details">详细信息</a></li>
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<h1 class="title">AnchorChanges QML 类型</h1>
<span class="subtitle"></span>
<!-- $$$AnchorChanges-brief -->
<p>Specifies how to change the anchors of an item in a state. <a href="#details">更多...</a></p>
<!-- @@@AnchorChanges -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句：</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr></table></div><ul>
<li><a href="qml-qtquick-anchorchanges-members.html">所有成员的列表，包括继承成员</a></li>
</ul>
<a name="properties"></a>
<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors-prop">anchors</a></b></b><ul>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.left-prop">anchors.left</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.right-prop">anchors.right</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.horizontalCenter-prop">anchors.horizontalCenter</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.top-prop">anchors.top</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.bottom-prop">anchors.bottom</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.verticalCenter-prop">anchors.verticalCenter</a></b></b> : AnchorLine</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#anchors.baseline-prop">anchors.baseline</a></b></b> : AnchorLine</li>
</ul>
</li>
<li class="fn"><b><b><a href="qml-qtquick-anchorchanges.html#target-prop">target</a></b></b> : Item</li>
</ul>
<!-- $$$AnchorChanges-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p>The <a href="qml-qtquick-anchorchanges.html">AnchorChanges</a> type is used to modify the anchors of an item in a <a href="qml-qtquick-state.html">State</a>.</p>
<p><a href="qml-qtquick-anchorchanges.html">AnchorChanges</a> cannot be used to modify the margins on an item. For this, use <a href="qml-qtquick-propertychanges.html">PropertyChanges</a> intead.</p>
<p>In the following example we change the top and bottom anchors of an item using <a href="qml-qtquick-anchorchanges.html">AnchorChanges</a>, and the top and bottom anchor margins using <a href="qml-qtquick-propertychanges.html">PropertyChanges</a>:</p>
<pre class="qml">

  import QtQuick 2.0

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">id</span>: <span class="name">window</span>
      <span class="name">width</span>: <span class="number">120</span>; <span class="name">height</span>: <span class="number">120</span>
      <span class="name">color</span>: <span class="string">&quot;black&quot;</span>

      <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> { <span class="name">id</span>: <span class="name">myRect</span>; <span class="name">width</span>: <span class="number">50</span>; <span class="name">height</span>: <span class="number">50</span>; <span class="name">color</span>: <span class="string">&quot;red&quot;</span> }

      <span class="name">states</span>: <span class="name">State</span> {
          <span class="name">name</span>: <span class="string">&quot;reanchored&quot;</span>

          <span class="type"><a href="qml-qtquick-anchorchanges.html">AnchorChanges</a></span> {
              <span class="name">target</span>: <span class="name">myRect</span>
              <span class="name">anchors</span>.top: <span class="name">window</span>.<span class="name">top</span>
              <span class="name">anchors</span>.bottom: <span class="name">window</span>.<span class="name">bottom</span>
          }
          <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> {
              <span class="name">target</span>: <span class="name">myRect</span>
              <span class="name">anchors</span>.topMargin: <span class="number">10</span>
              <span class="name">anchors</span>.bottomMargin: <span class="number">10</span>
          }
      }

      <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> { <span class="name">anchors</span>.fill: <span class="name">parent</span>; <span class="name">onClicked</span>: <span class="name">window</span>.<span class="name">state</span> <span class="operator">=</span> <span class="string">&quot;reanchored&quot;</span> }
  }

</pre>
<p class="centerAlign"><img src="images/anchorchanges.png" alt="" /></p><p><a href="qml-qtquick-anchorchanges.html">AnchorChanges</a> can be animated using <a href="qml-qtquick-anchoranimation.html">AnchorAnimation</a>.</p>
<pre class="qml">

  <span class="comment">//animate our anchor changes</span>
  <span class="type"><a href="qml-qtquick-transition.html">Transition</a></span> {
      <span class="type"><a href="qml-qtquick-anchoranimation.html">AnchorAnimation</a></span> {}
  }

</pre>
<p>Changes to anchor margins can be animated using <a href="qml-qtquick-numberanimation.html">NumberAnimation</a>.</p>
<p>For more information on anchors see <a href="qtquick-positioning-anchors.html">Anchor Layouts</a>.</p>
<!-- @@@AnchorChanges -->
<h2>属性文档</h2>
<!-- $$$anchors -->
<div class="qmlitem"><div class="qmlproto"><div class="table"><table class="qmlname"><tr valign="top" class="even" id="anchors-prop"><th class="centerAlign"><p><a name="anchors-prop"></a><b>anchors group</b></p></th></tr><tr valign="top" class="odd" id="anchors.left-prop"><td class="tblQmlPropNode"><p><a name="anchors.left-prop"></a><span class="name">anchors.left</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.right-prop"><td class="tblQmlPropNode"><p><a name="anchors.right-prop"></a><span class="name">anchors.right</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.horizontalCenter-prop"><td class="tblQmlPropNode"><p><a name="anchors.horizontalCenter-prop"></a><span class="name">anchors.horizontalCenter</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.top-prop"><td class="tblQmlPropNode"><p><a name="anchors.top-prop"></a><span class="name">anchors.top</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.bottom-prop"><td class="tblQmlPropNode"><p><a name="anchors.bottom-prop"></a><span class="name">anchors.bottom</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.verticalCenter-prop"><td class="tblQmlPropNode"><p><a name="anchors.verticalCenter-prop"></a><span class="name">anchors.verticalCenter</span> : <span class="type">AnchorLine</span></p></td></tr><tr valign="top" class="odd" id="anchors.baseline-prop"><td class="tblQmlPropNode"><p><a name="anchors.baseline-prop"></a><span class="name">anchors.baseline</span> : <span class="type">AnchorLine</span></p></td></tr></table></div></div><div class="qmldoc"><p>These properties change the respective anchors of the item.</p>
<p>To reset an anchor you can assign <code>undefined</code>:</p>
<pre class="qml">

  <span class="type"><a href="qml-qtquick-anchorchanges.html">AnchorChanges</a></span> {
      <span class="name">target</span>: <span class="name">myItem</span>
      <span class="name">anchors</span>.left: <span class="name">undefined</span>          <span class="comment">//remove myItem's left anchor</span>
      <span class="name">anchors</span>.right: <span class="name">otherItem</span>.<span class="name">right</span>
  }

</pre>
</div></div><!-- @@@anchors -->
<br/>
<!-- $$$target -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="target-prop">
<td class="tblQmlPropNode"><p>
<a name="target-prop"></a><span class="name">target</span> : <span class="type"><a href="qml-qtquick-item.html">Item</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>This property holds the <a href="qml-qtquick-item.html">Item</a> for which the anchor changes will be applied.</p>
</div></div><!-- @@@target -->
<br/>
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